Pinch tube valve

ABSTRACT

A pinch tube type valve adapted to be mounted to a liquid container receiver to accept an elongated flexible outlet tube protruding from a liquid container disposed in the receiver for selecting control of liquid flow through the tube from the container. The tube is passed through a passageway in the valve body for selective engagement by a stem which is reciprocable into and out of closing engagement therewith. The passageway is enlarged adjacent the inlet end of the valve body to permit easy insertion of the liquid container outlet tube therethrough. An apertured tube retaining area is disposed adjacent the outlet end of the valve body passageway to receive and retain the tube in a desired position relative to the container receiver to facilitate ease of liquid dispensing operations. The stem may also include a tube engaging protrusion arrangement when the valve is contemplated for use in pressurized liquid systems.

This is a continuation, of application Ser. No. 508,208, filed Sept. 23,1974, now U.S. Pat. No. 3,976,277.

BACKGROUND OF THE INVENTION

This invention pertains to the art of valves and more particularly topinch tube type valves or faucets.

The invention is particularly applicable to dispensing liquids fromcontainers having an elongated flexible outlet tube disposed at thebottom end thereof and will be described with particular referencethereto; however, it will be appreciated by those skilled in the artthat the invention has broader applications and is equally applicable toany number of other liquid dispensing environments.

It has recently been found that it is extremely desirable to dispensecertain liquids from a large liquid reservoir into smaller containersfor use or consumption. A typical and merely exemplary specificenvironment of this situation is the case of serving wine inrestaurants. It has been found that many persons would purchase wineduring a meal if it was made available by the "glass" instead of only bythe "bottle." In an effort to increase wine sales in this particulartype of environment, a system has been devised whereby wine is dispensedfrom a reservoir arrangement and then sold by the glass. In this system,the wine is stored in flexible plastic bag-like containers which includean elongated flexible or pinch tube extending outwardly from thelowermost end thereof. A full bag or container is inserted into achiller or cooler arrangement with the pinch tube passing outwardlytherefrom through a valve arrangement in order that wine may beconveniently dispensed from the bag as needed. Although the problems andadvantages which the subject invention recognizes and overcomes werefirst apparent in this particular environment, it will be appreciatedthat it is readily adapted to use in other environments for any type ofliquid dispensing where it is desirable to employ a pinch tubedispensing arrangement.

Since in most pinch tube liquid dispensing arrangements of this generaltype liquid flows from the pinch tube by operation of gravity, it hasheretofore been extremely difficult to determine the exact arc or flowcharacteristics of the liquid as it exits the outlet end of the pinchtube since they continuously vary dependent upon the head of liquidremaining in the liquid container. Although a number of pinch tube typevalves have been previously developed and employed in similarenvironments these prior valves have not solved the operational problemsencountered in their use due to changes in the flow characteristics ofthe liquid issuing from the outermost end of the pinch tube. Normally,prior valves merely received and maintained the associated pinch tubesin "straight-line" configurations without any attendant considerationgiven to the angle of departure of liquid from the end of the tube. Whenthis angle was any angle other than vertical, undesired liquid spillageoccurred during liquid dispensing due to simple miscalculations as tothe flow path or arc of the liquid stream. Such spillage is costly, fromthe standpoint of unrecoverable loss of liquid, as well as unsightly andmessy from a housekeeping standpoint. This particular problem is furtherincreased by the fact that prior pinch tube type valves have looselyheld the outermost end of the tube so that it was easily moved or jarredto even further modify the liquid flow characteristics. Previousattempts at controlling the liquid flow path or arc by manipulating thelocation or direction of the pinch tubes has resulted in undesirablekinking and binding of the tubes which led to corresponding liquid flowrestrictions. These very same problems are also found in pressurizedliquid systems where pinch tubes and pinch tube type valves areutilized.

In the environment to which the subject invention is particularlyadapted, the liquid containers are periodically replaced when they areemptied with new, full containers. This, of course, requires removal ofthe pinch tube associated with the empty container from the pinch tubevalve and insertion of the pinch tube associated with the new fullliquid container into associated with the pinch tube valve. Normally,this requires "threading" the pinch tube along a narrow passage and hasheretofore been made very difficult because of the length of thepassageway and the close tolerances required between the outsidediameter of the tube and the inside diameter of the passageway. Theseclose tolerances were required primarily because of the specificoperational nature of prior pinch tube type valves.

Another problem which has been previously encountered with prior pinchtube valves in pressurized liquid systems has been one of liquid leakagethrough the valves. Since the basic concept behind such valves is one of"pinching" closed an elongated flexible tube along a portion thereof tocontrol liquid flow therethrough, it has been difficult to design aneasily threadable valve in which there would not be some liquid leakagethrough the pinched off area.

BRIEF DESCRIPTION OF THE PRESENT INVENTION

The present invention contemplates a new and improved article whichovercomes all of the above referred to problems and others and providesa new and improved pinch tube type valve which is simple in design,effective in both pressurized and unpressurized valving operations,economical to manufacture and readily adaptable to use in a wide rangeof liquid dispensing environments.

In accordance with the present invention, there is provided a new pinchtube type valve adapted to receive an elongated flexible tube forselective control of liquid through the tube. Accordingly, the valveincludes a valve body having upper and lower surfaces, an inlet end, anoutlet end, a first passageway interconnecting the inlet and outlet endsand a second passageway interconnecting the first passageway between theinlet and outlet ends thereof. Means for closing the valve are disposedin the second passageway, which means are selectively reciprocable inthat passageway into and out of physical engagement with an elongatedflexible tube disposed in the first passageway for controlling liquidflow through the tube. Tube retaining means are included in the lowersurface of the valve body adjacent the outlet end to retain theoutermost end of the tube in a particular desired position angularlydisposed of the first passageway for dispensing liquid therefrom.

In accordance with another aspect of the present invention, the tuberetaining means comprises an apertured area in the lower valve bodysurface communicating with the first passageway and extendinglongitudinally along a portion of the lower surface from the outlet endtoward the inlet end. The apertured area closely receives a portion ofthe flexible tube adjacent the outermost end thereof.

In accordance with another aspect of the present invention, the closingmeans comprises a stem member selectively reciprocable within the secondpassageway into and out of the first passage. This stem has a firstnormal position extending into the first passageway to physically engageand pinch closed a flexible tube disposed therein and a second positionwherein the stem is substantially withdrawn from the first passagewayfor allowing the tube to open.

In accordance with still a further aspect of the present invention, thestem includes a special tube engaging area and the first passagewayincludes a recess on the opposite side thereof from the area ofcommunication between the first and second passageways. The tubeengaging area of the stem forces a portion of the tube into the recessto more tightly close the tube when the stem is in the first position tofacilitate use of the valve in pressurized liquid environments.

In accordance with yet another aspect of the present invention, animprovement for pinch tube valves is provided which improvementcomprises tube retaining means disposed in the lower valve body surfaceadjacent the outlet end in order to retain the outermost end of thepinch tube in a particular desired position angularly disposed to thefirst passageway for dispensing liquid therefrom.

The principal object of the present invention is the provision of a newand improved pinch tube type valve which improves liquid dispensingoperations through a pinch tube associated with the valve.

Another object of the present invention is the provision of a new andimproved pinch tube type valve which is simple in design.

Still another object of the present invention is the provision of a newand improved pinch tube type valve which facilitates accurate guidingfor stream of liquid issuing from a pinch tube associated with thevalve.

Still another object of the present invention is the provision of a newand improved pinch tube type valve which facilitates ease of changingpinch tubes to be operatively associated with the valve.

Still a further object of the present invention is the provision of anew and improved pinch tube type valve which may be utilized inpressurized liquid systems.

Yet another object of the present invention is the provision of a newand improved pinch tube type valve which is readily adaptable for use inany number of liquid dispensing environments.

BRIEF DESCRIPTION OF THE FIGURES

The invention may take physical form in certain parts and arrangementsof parts, a preferred embodiment of which will be described in detail inthe specification and illustrated in the accompanying drawings whichform a part hereof and wherein:

FIG. 1 is a side view of the subject new and improved pinch tube typevalve shown in a typical contemplated liquid dispensing environment;

FIG. 2 is a cross-sectional view of the valve shown in FIG. 1;

FIG. 3 is a view taken along lines 3--3 in FIG. 2;

FIG. 4 is a cross-sectional view taken along lines 4--4 in FIG. 2showing the valve in a closed condition;

FIG. 5 is a view identical with FIG. 4 except for showing the valve inan opened condition;

FIG. 6 shows a partial and cross-sectional view of an alternative valvearrangement adapted for particular use in pressurized liquid systems;

FIG. 7 is a cross-sectional view taken along lines 6--6 in FIG. 6; and

FIG. 8 is a cross-sectional view similar to FIG. 7 showing anotheralternative structure employing guiding cooperation between the stem andvalve body.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring now to the drawings wherein the showings are for purposes ofillustrating the preferred embodiment of the invention only, and not forpurposes of limiting same, the FIGURES show the subject pinch tube valveas having a body portion A and a valve operating portion B with thevalve itself being mounted in an exemplary operative association with aliquid chiller structure C.

More specifically, and with reference to FIGS. 1 and 2, body portion Ais comprised of a valve body 10 having an upper surface 12, a lowersurface 14, an inlet end 16 and an outlet end 18. Inlet and outlet ends16, 18 are interconnected by a first passageway 20. This passageway hasa first portion 22 extending inwardly from inlet end 16 and merging,through merger zone 24, into a second portion 26. The first portion hasa greater cross-sectional dimension than the second portion and therelative sizes of both these portions to the outside diameter of a pinchtube will be described in greater detail hereinafter.

Valve operating portion B includes an operating portion housing 28having a second passageway 30 passing therethrough and intersecting thefirst passageway. It should be particularly noted that in the preferredembodiment of the present invention, the second passageway is positionedgenerally normal to the first passageway. In addition, it should also benoted that the second passageway intersects second portion 26, that is,the smaller cross-sectioned portion of first passageway 20.

Disposed adjacent inlet end 16 is a mounting and locating flange 40. Aswill be noted in both FIGS. 1 and 2, this flange is mounted at an angleto the longitudinal axis of the first passageway to facilitate angularmounting of the valve which, in turn, facilitates ease of fluid flow bymeans of gravity through a pinch tube disposed in the first passageway.Although any number of mounting angles could be employed, the preferredembodiment of the invention contemplates an angle which will dispose thevalve at approximately a 30° angle below the horizontal when the valveis mounted to a generally vertical mounting surface. Extending outwardlyfrom the rear side of flange 40 are a pair of mounting protrusions 42,44 which engage the mounting surface to prevent rotation of the valveonce it has been closely installed on mounting surface. Theseprotrusions are forced directly into a mounting surface as may beobserved from the showings of FIG. 1. Extending inwardly along firstportion 22 of first passageway 20 from inlet end 16 are internal threads46. These threads are employed in receiving valve mounting and retainingmeans to be described in greater detail hereinbelow.

For asthetic purposes in hiding the pinch tube itself from view as wellas for providing access to the tube for final location once it has beenthreaded through first passageway 20, front face 50 of outlet end 18 onthe vavle body is angled relative to the longitudinal axis of the firstpassageway. Although many angles may be satisfactorily utilized, thepreferred embodiment of the present invention contemplates front face 50being angled toward outlet end 18 from upper surface 12 toward lowersurface 14 at an angle of approximately 45°.

Disposed in lower surface 14, extending from outlet end 18 toward inletend 16 and communicating with the passageway 20 is an apertured tuberetaining means generally designated 52. As best shown in FIGS. 2 and 3,this means is comprised of a slot-like aperture 54 which leads into aslightly larger, generally circular tube retaining portion 56. Ofcourse, portion 56 could take other configurations without departingfrom the intent and scope of the present invention. In FIG. 2, it willbe seen that the innermost end of this tube retaining portion is angledthrough lower surface 14 so that it is disposed at approximately thesame angle as mounting and locating flange 40 relative to thelongitudinal axis of passageway 20. The reasons for this particulararrangement will become readily apparent hereinafter in the descriptionof operation of the valve. Slot-like aperture 54 has a width less thanthe outside diameter of an associated pinch tube and retaining portion56 is approximately the same diameter as the outside diameter of thatsame pinch tube. Thus, the sides of a pinch tube may be squeezedtogether and then forcibly moved through the slot-like portion into thetube retaining portion and then retained in the tube retaining portionduring liquid dispensing from the valve as will be describedhereinafter.

Valve body 10 may be constructed from any convenient material as, forexample, brass or plastic and in any convenient manner as, for example,by casting or molding. Since the valve structure itself is not directlysubjected to liquid pressures and merely acts as a housing for a pinchtube as well as means for selectively opening and closing the pinch tubeto control liquid flow therefrom, it need not be constructed of amaterial having particularly high physical strength characteristics. Forthis reason, a molded plastic construction is preferred since it adds toreducing the cost of producing the valve. It is also contemplated thatthe valve body will take the specific physical appearance shown in thedrawings where body 10 and operating portion housing 28 are generallycylindrical and where first and second passageways 20, 30 are alsogenerally cylindrical. However, other configurations could also besatisfactorily employed without departing from the intent and scope ofthe present invention.

A bonnet 70 is threadedly received on the outermost end of operatingportion housing 28 as at threads 72. An elongated stem member 74 isreceived in second passageway 30 and includes a pinch tube closing end76 and an actuating end 78 separated by an outwardly extending flange80. End 76 is selectively extensible into and out of first passageway 20and end 78 extends outwardly of housing 28 through bonnet 70 which inturn, acts as a guide for the stem. A coil spring 82 is received overend 78 and retained in a state of compression between flange 80 and theinside of bonnet 70 for purposes of exerting a continuous biasing forceagainst flange 80 for urging the stem into the first passageway. In thepreferred arrangement, at least pinch tube closing end 76 iscontemplated as being generally cylindrical and includes a generousradius 84 at the outermost end thereof. It is this area as well as theoutermost end 86 of the pinch tube closing end which actually engage thepinch tube when it is to be closed. It should be noted, however, thatother configurations for ends 76, 86 could advantageously be employedwithout departing from the scope and intent of the present invention.

Disposed adjacent bonnet 70 is a valve actuating handle generallydesignated 90. This handle and stem 74 are interconnected at a pivotmounting 92 to permit relative rockable rotation therebetween. Thehandle also includes a first cam surface 94 adjacent the front side ofthe handle and a second cam surface 96 adjacent the rear side of thehandle. Cam surface 94 comprises a gradual arcuate cam whereas camsurface 96 comprises a more abrupt arcuate cam. With the handle in theposition shown in FIGS. 1 and 2, the valve is in what may be termed thefirst, normal or closed condition with the tube closing end 76penetrating first passageway 20. Actuating handle 90 is arcuatelymovable or rockable about pivot mounting 92 in either of the directionsa or b as shown in FIG. 1. Movement in either direction causes movementabout one of cam surfaces 94, 96 to withdraw the stem from its fullinsertion into the first passageway back into the second passagewaytoward a second or opened position where the stem is substantiallywithdrawn from the first passageway. Because of the general slopingnature of cam surface 94, when handle 90 is moved in direction b andthen released, the biasing force provided by coil spring 82 forces thestem and handle back to the first, normal or closed position. However,because of the more abrupt design of cam surface 96, when the handle ismoved in direction a, the handle and stem will be retained in an openedposition even when the biasing pressure on the handle is released. Thisposition then provides convenient means for permitting threading andunthreading of a pinch tube through the valve when it is required and/ordesired. The specifics of the design and operation for handle 90 and camsurface 94, 96 are deemed known in the art and do not, in and ofthemselves, comprise a portion of the present invention. Other valvehandle arrangements could also be used without departing from the scopeand intent of the present invention.

For purposes of mounting the subject valve to a mounting surface, amounting and retaining means generally designated 100 is advantageouslyprovided. In this means, an elongated hollow threaded member 102 isprovided which is conveniently threadedly received in internal threads46. This member, as well as that portion of inlet end 16 spaced outboardof mounting and locating flange 40 are received through a hole providedin a surface to which the valve is to be mounted. Also provided is aspacer sleeve 104 having a front face 106 angled relative to thelongitudinal axis of first passageway 20 at the same angle as mountingand locating flange 40. Finally, a tightening or jam nut 108 isthreadedly received on threaded member 102 for closely drawing mountingand locating flange 40 against one side of a mounting surface and forforcing face 106 of spacer sleeve 104 against the other side of amounting surface so that the valve may be rigidly mounted to thatsurface. Mounting protrusions 42, 44 penetrate the mounting surfaceduring the installation and tightening process to prevent rotation ofthe valve relative to the mounting surface and retain the valve in theproper position.

In a typical and merely exemplary use environment contemplated for thesubject valve, attention is invited to FIG. 1 which generally shows aliquid chiller C. The chiller includes side and bottom walls 120, 122respectively with each wall having a thin inner wall 124 and a thinouter wall 126 with a conventional heat insulative material 128 disposedtherebetween. The specifics of the chiller construction do not form apart of the present invention and, therefore, are not described ingreater detail herein. In addition to the chiller structure justdescribed, means are included to provide a heat sink for the chiller andthus cool or refrigerate the liquid contents disposed therein. Again,the valve of the subject invention may be used in any number of otherliquid system dispensing environments. Operation of the valve itself,however, will be substantially identical in all such environments. Itshould be particularly appreciated, however, that use of the subjectvalve is not intended to be limited to the environment in which it isbeing described and that it is equally applicable to other dispensingenvironments employing other types of liquid containers or arrangementswhich include elongated pinch tubes for dispensing purposes.

In the specific type of environment in which the subject new andimproved valve is being described, chiller C acts as a liquid containerhousing. It is contemplated that wine or other liquid will be placed inmulti-ply plastic bags generally designated 140 in FIG. 1. Although anysize of bag could be used depending upon the chiller size, one gallonvolume bags are contemplated. Affixed to and extending outwardly fromthe lowermost portion of the bag is an elongated pinch tube 142.Although this tube could be manufactured from a number of materials, aresilient plastic tube is deemed to be particularly desirable. Thelength of the tube may vary; however, it is contemplated that the tubewill be longer than required to extend from the chiller outwardlythrough the valve in order that it may be trimmed to the length requiredfor a particular installation. Likewise, the outside diameter of pinchtube 142 may vary; however, it should be understood that this outsidedimension is to be at least slightly smaller than the diameter of secondportion 26 of first passageway 20.

In using the subject new and improved valve, bag 140 with its liquidcontents is placed into chiller C and the pinch tube inserted into andthrough elongated hollow threaded member 102 to then pass into and alongfirst passageway 20 and longitudinally outward of that passageway fromoutlet end 18. Of course, the outermost end of the pinch tube mayinitially be sealed or otherwise closed during this procedure to preventundesired premature liquid flow therefrom. Also, valve handle 90 must bemoved in either direction a or b to move end 76 of stem 74 from thefirst or closed position into the second or opened position fullywithdrawn from the first passageway. Normally, the handle is moved indirection a over cam surface 96 in order that the stem will be retainedin the opened position. Since the stem is substantially withdrawn fromthe first passageway into the second passageway in its opened positionand inasmuch as the diameters of passageway 20 are greater than theoutside diameter of pinch tube 142, particularly first portion 22,threading of the tube through the valve is made quite simple. Once thetube has been threaded, it is then pinched, squeezed or temporarilydeformed by hand in order that it may be forced along slot-like portion54 of the tube retaining means 52 from outlet end 18 toward inlet end16. As the tube enters retaining portion 56, the hand deformationpressure is released and the tube allowed to open. Since the diameter oftube retaining portion 56 is substantially the same as the outsidediameter of the tube itself, the tube will fully open and then beretained in portion 56 until removed therefrom by the reverse processhereinabove just described.

Once threading of the tube has been completed, actuating handle 90 mayagain be moved so that pinch tube closing end 76 of stem 74 is returnedto the first, normal or closed position so that it engages pinch tube142 to "pinch" it closed as best shown in FIG. 4. With that, theoutermost end of the pinch tube may be trimmed or otherwise opened inorder that liquid may flow from container 140 through the pinch tube.Because of the overall valve design, the pinch tube is not kinked orcrimped at this retaining area so that there are no restrictions to fullliquid flow through the tube as had been the case in previous attemptsof this general type as applied to pinch tube type valves. As will benoted in FIGS. 2 and 3, the outermost end of the pinch tube ispositioned in retaining portion 56 generally parallel to mounting andlocating flange 40. It is contemplated that in the preferred normalusage, the valve will be mounted to an approximately vertically disposedsurface so that the outermost end of the pinch tube will also bevertically disposed. With this disposition, liquid issuing from the endof the pinch tube as the valve is opened will not stream or arcoutwardly thereof and will, instead, take a substantially vertical pathfrom the tube for easy and precise filling of a container, glass or thelike. This arrangement thus overcomes the difficulty of having to judgeor approximate a liquid flow path which normally has had the undesirableresults of liquid loss due to inadvertent spillage with attendanthousekeeping problems.

With particular reference to FIGS. 4 and 5, the specific location of thestem is shown for the first or valve closed and the second or valveopened positions. In FIG. 4, it will be seen that the outermost end 86and radiused area 84 of pinch tube closing end 76 engage the pinch tubeto force it into a closed condition. Again, second portion 26 ofpassageway 20 is of a greater diameter than pinch tube 142 to facilitatetube threading and pinch tube closing end 76 is of a lesser dimensionthan the pinch tube so that in the closed condition, the pinch tube isslightly bent upwardly around radiused area 84 into the closedcondition. These dimensional relationships are deemed ritical insofar asthey insure complete "closing" of the pinch tube. That is, thesedimensions must be such that the outermost ends of the generally arcuateconfiguration of the area of the pinch tube which is closed are alsocompletely closed. If the dimensional relationships are incorrect, someliquid leakage may undesirably occur at these outermost ends when thevalve is in the closed condition. The pinch tube closing end iscontinuously biased into engagement with the pinch tube through theaction of coil spring 82 and there is no positive stop for the stemexcept the pinch tube itself. This action thus compensates for slightnormal variations occurring in the pinch tube diameter, pinch tube wallthickness and so on. When the valve is moved to the opened position asshown in FIG. 5, pinch tube closing end 76 is substantially withdrawnfrom second portion 26 of first passageway 20 into passageway 30 so thatit will not interfere with threading and unthreading of the pinch tube.Since the pinch tube is constructed of a resilient plastic material, thetube will automatically open to permit liquid flow therethrough as thevalve stem is moved from the first toward the second position.

When the liquid contents of container 140 have all been dispensed, it ismerely necessary to again pinch, squeeze or otherwise temporarily deformthe pinch tube and force the outermost end thereof through slot-likeportion 54 until it is again protruding generally longitudinally fromoutlet end 18. Thereafter, valve stem may be moved from the closed tothe opened position and the pinch tube easily withdrawn from thepassageway 20 in order that the container may, in turn, be removed fromliquid chiller C. Thereafter, a new, filled container may be placed inthe chiller and the pinch tube threading process repeated as hereinabovedescribed.

FIGS. 6 and 7 show a slight variation of the valve stem arrangementwhich may be particularly advantageous for use in pressurized liquidsystems. For ease of illustration and since only the valve stemstructure differs in this alternative embodiment, like primed (')numerals will be used for like components and new numerals are used fornew components.

Accordingly, pinch tube closing end 76' of the valve stem includes alongitudinally outward extending tube engaging protrusion 150 fromoutermost end 86'. This protrusion is contemplated to have a thicknessless than the diameter of closing end 76' while extending arcuatelyacross substantially the entire diameter of that end. Other arrangementsand configurations of protrusion 150 may also be used without departingfrom the intent and scope of the present invention as, for example,making the entire tube engaging portion 76' the same thickness asprotrusion 150.

Oppositely disposed from protrusion 150, second portion 26 of firstpassageway 20 includes a protrusion receiving area 152. This area hasthe same general configuration as the protrusion itself but is slightlyenlarged therefrom for reasons which will become apparent hereafter.

With this alternative arrangement and when the valve is in the first orclosed position, protrusion 150 operates to force a portion of pinchtube 142' into receiving area 152. This action operates to assure bothgreater closure of the tube and increased resistance to liquid passingthrough the pinched off area. Because of the resilient nature of thetube, no permanent deformation thereof is experienced. This feature ofparticularly valuable when the valve is to be used in a pressurizedliquid system where the liquid might otherwise be forced through thepinched off area to cause undesired liquid leakage.

In conjunction with this alternative embodiment and as shown in FIG. 8,it may also be desirable to extend the length of protrusion 150 and theconfiguration of receiving area 152 so that the receiving area extendstransversely across the inside of the entire bottom surface 14' ofsecond portion 26' and upwardly along the side walls thereof to bothreceive and guide the protrusion between the first and second positions.This feature eliminates unintentional rotational shifting of the stemrelative to its preferred operative position which might otherwiseaffect operation of the valve.

With this last discussed feature, it is also possible to vary theoverall physical design of at least pinch tube closing end 76'. Thisthen may be used to compensate for variances in tube designs and tubeclosing requirements encountered in different types of liquid dispensingsystems and environments.

Again, the concepts of the subject invention are not limited toapplication in the specific liquid dispensing environment described andit should be understood that it is readily adapted to use in any numberof liquid dispensing environments and pinch tube type containers orarrangements.

The invention has been described with reference to the preferredembodiment. Obviously, modifications and alterations will occur toothers upon the reading and understanding of this specification. It isour intention to include all such modifications and alterations insofaras they come within the scope of the appended claims or the equivalentsthereof.

Having thus described our invention, we now claim:
 1. A pinch tube typevalve adapted to receive an elongated flexible tube for selectivecontrol of liquid through said tube, said valve comprising;a valve bodyhaving upper and lower surfaces, an inlet end, and outlet end, a firstenclosed passageway interconnecting said inlet and outlet ends and asecond enclosed passageway disposed generally transversely to andcommunicating with said first passageway between said ends, said valvebody further including mounting means for mounting said valve in adesired position to a mounting surface; means for closing said valvedisposed in said second passageway, said closing means comprising a stemmember selectively reciprocal within said second passageway into saidfirst passageway, said stem having a first position extending into saidfirst passageway and adapted to act against said tube to force said tubeinto a closed condition to prevent liquid flow therethrough and a secondposition withdrawn from engagement with said tube toward said secondpassageway to allow liquid flow through said tube, said closing meansfurther including spring biasing means disposed in said secondpassageway operating against said stem to continuously urge said stemtoward said first position; and, a distinct tube engaging protrusionextending outwardly from the outermost end of said stem wherein saidprotrusion has a width dimension as measured generally transverse ofsaid first passageway and a thickness dimension as measured generallynormal to said width dimension, said width being generally equal to thelateral dimension of said stem outermost end with said thickness beingless than said width such that said protrusion comprises a generallyrib-like area disposed transverse of said first passageway, saidprotrusion being cooperable with a distinct protrusion receiving area inthe side wall of said first passageway opposite said second passagewaywith said receiving area having generally the same configuration as saidprotrusion and extending generally transversely across said firstpassageway whereby when said stem is in said first position, saiddistinct tube engaging protrusion engages said tube to force a portionthereof at least slightly into said distinct protrusion receiving areafor more tightly closing said tube.
 2. The valve as defined in clai 1wherein said tube engaging protrusion and protrusion receiving areaextend generally transversely across at least the entire width of saidfirst passageway, said valve further including means for guiding saidtube engaging protrusion in a desired orientation relative to saidprotrusion receiving area as said valve stem is selectively movedbetween said first and second positions.
 3. The valve as defined inclaim 1 wherein said protrusion receiving area has slightly greaterwidth and thickness dimensions than the width and thickness dimensionsof said protrusion.
 4. The valve as defined in claim 3 wherein said tubeengaging protrusion has an outwardly extending generally arcuateconfiguration over the width thereof and said protrusion receiving areahas a corresponding arcuate configuration over the width thereof.
 5. Apinch tube type valve adapted to receive an elongated flexible tube forselective control of liquid through said tube, said valve comprising:avalve body having upper and lower surfaces, an inlet end, an outlet end,a first enclosed passageway interconnecting said inlet and outlet endsand a second enclosed passageway disposed generally transversely to andcommunicating with said first passageway between said ends, said valvebody further including mounting means for mounting said valve in adesired position to a mounting surface; means for closing said valvedisposed in said second passageway, said closing means comprising a stemmember selectively reciprocal within said second passageway into saidfirst passageway, said stem having a first position extending into saidfirst passageway and adapted to act against said tube to force said tubeinto a closed condition to prevent liquid flow therethrough and a secondposition withdrawn from engagement with said tube toward said secondpassageway to allow liquid flow through said tube, said closing meansfurther including spring biasing means disposed in said secondpassageway operating against said stem to continuously urge said stemtoward said first position; a distinct tube engaging protrusionextending outwardly from the outermost end of said stem cooperable witha distinct protrusion receiving area in the side wall of said firstpassageway opposite said second passageway with said protrusion andprotrusion receiving area extending generally transversely across atleast a portion of the width of said first passageway whereby when saidstem is in said first position said distinct tube engaging protrusionengages said tube to force a portion thereof at least slightly into saiddistinct protrusion receiving area for more tightly closing said tube;and, means for guiding said tube engaging protrusion in a desiredorientation relative to said protrusion receiving area as said valvestem is selectively moved between said first and second positions, saidguiding means comprising cooperable means between said stem and valvebody, said cooperable means being defined by said valve body having atleast one slot area in the side wall of said first passageway extendinggenerally transverse thereto and said stem including a portion thereofdimensioned to be slidably received in said at least one slot area. 6.The valve as defined in claim 5 wherein said tube engaging protrusionand protrusion receiving area extend generally transversely across atleast the entire width of said first passageway.